Dielectric Constant Measurement of Liquids Using Nanosecond-Pulsed Signals
In this paper, we report a novel method to measure the dielectric constant of various liquids of limited amount. The liquid under test is sealed in a coaxial-like test device. The dielectric constant is determined by comparing the delay of a nanosecond-pulsed signal traveling through the test device with that traveling through a reference coaxial cable. The results show that the maximum error of this kind of measurement is within 15-30%, which is good enough for a semi-quantitative estimation of the dielectric constant of an unknown liquid, especially when the amount of the liquid is not enough for investigation with other existing approaches.
W. Q. Sun et al., "Dielectric Constant Measurement of Liquids Using Nanosecond-Pulsed Signals", Key Engineering Materials, Vol. 483, pp. 755-759, 2011